Goodman CVC9/95 Installation Instructions Manual page 18

COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
INTAKE
SCREEN
OPTIONAL
12" MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
STRAIGHT
12" MIN.
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
D V (D P
IRECT ENT UAL IPE
The inlet air screens provided in the installation instruction packet
are available for the installer to use in the inlet of the combustion air
pipe to prevent animals from building nests in the combustion air
pipe. Installation of screens, while strongly recommended, is not
required and will not affect performance of the unit.
Direct vent installations require both a combustion air intake and a
vent/flue pipe. The pipes may be run horizontally and exit through
the side of the building or run vertically and exit through the roof of
the building. The pipes may be run through an existing unused
chimney; however, they must extend a minimum of 12 inches
above the top of the chimney. The space between the pipes and
the chimney must be closed with a weather tight, corrosion resis-
tant flashing. Both the combustion air intake and a vent/flue pipe
TEE (OPTIONAL)
12" MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
ELBOWS
VENT/FLUE TEE ( OPTIONAL)
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
) P
IPING
terminations must be in the same atmospheric pressure zone.
Refer to Vent/Flue and Combustion Air Pipe - Termination Loca-
tions or Concentric Vent Termination for specific details on termi-
nation construction. For details concerning connection of pipes to
the furnace, refer to the Vent/Flue Pipe and Combustion Pipe -
Standard Furnace Connections or Alternate Furnace Connec-
tions.
V /F &C
ENT LUE OMBUSTION
Refer to the following table for applicable length, elbows, and pipe
diameter for construction of the vent/flue and combustion air in-
take pipe systems of a direct vent (dual pipe) installation. The
number of elbows tabulated represents the number of elbows
and/or tees in each (Vent/Flue & Combustion Air Intake) pipe.
Elbows and/or tees used in the terminations must be included
when determining the number of elbows in the piping systems.
If the combustion air intake pipe is to be installed above a finished
ceiling or other area where dripping of condensate will be objec-
tionable, insulation of the combustion air pipe may be required.
Use 1/2" thick closed cell foam insulation such as Armaflex™ or
Insultube™ where required.
V /F C
ENT LUE AND OMBUSTION
The vent/flue and combustion air pipes may terminate vertically,
as through a roof, or horizontally, as through an outside wall.
Vertical pipe terminations should be as shown in the following
figure. Refer to Vent/Flue Pipe and Combustion Pipe - Termina-
tion Locations for details concerning location restrictions. The
penetrations through the roof must be sealed tight with proper
flashing such as is used with a plastic plumbing vent.
Horizontal terminations should be as shown in the following figure.
Refer to Vent/Flue Pipe and Combustion Pipe - Termination Loca-
tion for location restrictions. A 2 3/8" diameter wall penetration is
required for 2" diameter pipe. A 3" diameter hole is required for a 2
1/2" pipe and a 3 1/2" diameter hole is required for 3" diameter
pipe. The wall penetration should be sealed with silicone caulking
material.
10"- 24"
6" MAX
4" MIN
90º OR 45°
ELBOW
SCREEN
(OPTIONAL)
Standard Horizontal Terminations (Dual Pipe)
18
A P L &D
IR IPE ENGTHS IAMETERS
A P T
IR IPE ERMINATIONS
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL